31. Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is O1while the pressure on H is P2, If the atmospheric pressure is equivalent to 10m of water, then the value of P2/P1is
- A. 0.50
- B. 0.60
- C. 1.67
- D. 2.00
32. 
The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40oo, then the value of W is
- A. 28.0N
- B. 48.0N
- C. 288.0N
- D. 50.0N
33. 
In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80oC is known as the
- A. cooling temperature
- B. boiling point
- C. melting point
- D. vaporization point
34. In the figure, the value of R is
- A. 3Ω
- B. 6Ω
- C. 4Ω
- D. 5Ω
35. Which of the following instruments consumes the highest current?
I. Electric iron II. Television set III. Torch light IV. Immersion heater | 250v 220v 6v 110v | 1kW 110W 30W 500W |
- A. I
- B. II
- C. III
- D. IV
36.
In which of the following diagrams is the length of the tube equal to one wavelength?
- A. a
- B. b
- C. c
- D. d
37. A hydrometer is an instrument for measuring the
- A. a depth of water of water in a vessel
- B. relative density of a liquid by the method of flotation
- C. relative density of a liquid by finding the apparent loss in weight
- D. relative humidity of the air
38. A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?
- A. 1600
- B. 1200
- C. 200
- D. 2400
